用Myeclipse调试web项目，新建一个空项目以debug模式启动就出现如下错误，怎么回事？
严重: The web application [/hello] created a ThreadLocal with key of type [com.sun.faces.util.Util$1] (value [com.sun.faces.util.Util$1@101b085]) and a value of type [java.util.HashMap] (value [{com.sun.faces.patternCache={ = }}]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
补充：Java , Web 开发
